Improvement in pump-pistons



C. GILL.

Pump-Piston.

N0. 127,594. Patented June 4,1872.

UNITED STATES CALVIN B. GILL, OF WEEDSPOBT, NEW YORK.

IMPROVEMENT IN PUMP-PISTONS.

Specification forming part of Letters Patent No. 127,594, dated June 4,1872.

SPECIFICATION.

I, CALVIN B. GILL, of Weedsport, in the county of Cayuga, in the Stateof New York, have invented certain Improvements in Pump- Pistons, ofwhich the following is a specification:

The nature of my invention consists in making a plunger for pumps,having two heads joined together by two or more webs near their centers,and having a ring-valve between them to close their ports alternately.

Figure 1 is a vertical transverse section taken through Fig. 2 at lineo. Fig. 2 is a transverse section, showing the position of webs a andingress-ports a0. Fig. 3 is a top view of the ring-valve used in thisplunger.y

The head H, Fig. 1, has an opening in the center to receive theexit-pipe P. There are Y three in gress-ports, at equal distances apart,

between the pipe P and the rim of the heads H. 0n the upstroke (thepiston being in a cylinder having a side passage) the water flows inthrough these ports and between the webs a, Figs. l and 2, up throughthe exit-pipe P, the ring-valve f, Figs. l and 3, closing theingress-ports in the lower head G. The lower head G is similar inconstruction to H, only it is solid in the center, not requiring anyopening. Ithas ingress-portsm silnilar to H, through which, on thedown-stroke of the piston, the water passes; thence, between the webs a,into the exit-pipe P. These two heads, H and G, are held together bywebsa, all being east together. The valve f, Figs. l and 3, is a solid ilatrin g-valve, and is placed in position by the following device: Thevalve is first finished on its face sides, and the center opening ismade sufficiently large to receive the webs a. The valve is then placedin the sand core, which is necessary to keep the two heads H and G apartwhile being cast. After the casting is made the sand is cleaned off thering-valve, and the face sides of heads H and G are turned up in a latheso that the ring-valve will it the seats exactly. This mode of making apiston-head and its valve is cheap and forms a reliable plunger. Thisplunger is used in a cylinder having a side passage.

The operation of this piston is as follows: Being placed in a cylinderhaving a side passage, on the down-stroke the ring-valve f is caused torise and close the ingress-ports of head H. The water entering the ports:v ot the lower head G passes through, between the webs a, into theexit-pipe P. On the upward stroke the valve f is forced down and closesthe ingress-ports of the lower head G, the water passing through theports in the upper head H, and between the webs a, into the exit-pipe PI am aware that pump-pistons composed of two heads connected by webs,and fitted with an interposed valve, have been made prior to myinvention; but this l do not claim broadly, my improvement consisting inthe peculiar con struction of the piston, as herein set forth.

That I claim as my invention, and desire to secure by Letters Patent,is-

The improved pump-piston herein described, composed of heads G H withopenings w, and connected by webs a a a arranged in a circle near thecenter of the heads, and the rin g-valve f surrounding the webs t andsliding thereon, when said parts G H a are made in one piece and unitedwith the valve in the process of casting, as herein set forth.

- CALVIN B. GILL.

Witnesses:

JAs. LORENZO GAGE, A. BAINE.

